Maxine Hanks, one of the "September Six" has become a member again in the Mormon Church in February. She was expelled 1993 and never thought she would become a member again.
This has partly been a change in leadership in view of which is an internal threat to the church. Previously, they wanted to exclude, to protect, but now it has rather the view that people come with different experiences that they bring into the church, and that these contributions are not a threat but an asset.
Today requires extremely much for her exclusion (excommunicated). Honestly .. I know of one member who is a partner and not married (yet). The person is not active but is in contact with the church sometimes. The leaders know full well that the member is not married. In the past it would have been an exclusion, but it has not happened now. Something has changed.